September weather forecastIwaki, Japan
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Iwaki, Japan, with temperature in the range of an average low of 17.5°C (63.5°F) and an average high of 23.8°C (74.8°F).Temperature
The arrival of September suggests a slight decrease in the average high-temperature, moving from 27.5°C (81.5°F) in August to a still moderately hot 23.8°C (74.8°F). Iwaki experiences a consistent average temperature of 17.5°C (63.5°F) throughout the nights in September.Humidity
In September, the average relative humidity is 82%.Rainfall
In Iwaki, in September, it is raining for 16.4 days, with typically 113mm (4.45") of accumulated precipitation. Throughout the year, in Iwaki, there are 195.5 rainfall days, and 1085mm (42.72") of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In Iwaki, Japan, the average length of the day in September is 12h and 26min.On the first day of September in Iwaki, Japan, sunrise is at 05:07 and sunset at 18:05. On the last day of the month, sunrise is at 05:31 and sunset at 17:21 JST.
Sunshine
In Iwaki, the average sunshine in September is 7.6h.UV index
In September, the average daily maximum UV index in Iwaki, Japan, is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 5 in September translates into this advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Iwaki, Japan
- Average high temperature in September: 23.8°C
The warmest month (with the highest average high temperature) is August (27.5°C).
The month with the lowest average high temperature is January (5.1°C).
- Average low temperature in September: 17.5°C
The month with the highest average low temperature is August (20.8°C).
The coldest month (with the lowest average low temperature) is January (-1.1°C).
Average pressure in September
Iwaki, Japan
- Average pressure in September: 1014mbar
The month with the highest atmospheric pressure is November (1018.5mbar).
The month with the lowest atmospheric pressure is June (1009.4mbar).
Average wind speed in September
Iwaki, Japan
- Average wind speed in September: 10.7km/h
The windiest month (with the highest average wind speed) is January (16.5km/h).
The calmest month (with the lowest average wind speed) is July (9.4km/h).
Average humidity in September
Iwaki, Japan
- Average humidity in September: 82%
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is January (70%).
Average rainfall in September
Iwaki, Japan
- Average rainfall in September: 113mm
The wettest month (with the highest rainfall) is October (152mm).
The driest months (with the least rainfall) are January and February (45mm).
Average rainfall days in September
Iwaki, Japan
- Average rainfall days in September: 16.4 days
The month with the highest number of rainy days is July (23.9 days).
The month with the least rainy days is February (10.8 days).
Average snowfall in September
Iwaki, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (67mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Iwaki, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Iwaki, Japan
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 7h and 36min
The month with the most sunshine is August (Average sunshine: 9h and 24min).
The month with the least sunshine is February (Average sunshine: 5h and 48min).
Average sunshine days in September
Iwaki, Japan
- Average sunshine days in September: 9.6 days
The month with the most sunshine days is November (15.4 days).
The month with the least sunshine days is July (3.8 days).
Average UV index in September
Iwaki, Japan
- Average UV index in September: 5
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover in September
Iwaki, Japan
- Average cloud cover in September: 42
The month with the most cloud cover is July (Cloud cover 49).
The month with the least cloud cover is January (Cloud cover 33).
Average visibility in September
Iwaki, Japan
- Average visibility in September: 9km
The months with the highest visibility are November and December (10km).
The month with the lowest visibility is July (8km).
